



■*> 











%f-.3«^ii^ 



OVARY AND ADRENAL OF TWO-MONTHS-OLD CHICK 



Figure 5. Showing the cellular continuity of the ovary and adrenal. In the hen they 

 are histologically continuous, at least up to the time of laying. Consequently it is not 

 remarkable that tumor growth affecting the ovary should involve the adrenal also. 



of groups of cells most numerous in the 

 proximal portion, but scattered through- 

 out the gonad. In the region immedi- 

 ately adjacent to the non-ovarian part 

 of the tumor these cells were extremely 

 numerous and on section appeared as 

 a continuous band. The luteal cells 

 w^ere everywhere most conspicuous, 

 being without exception crowded with 

 pigment granules which frequently ob- 

 scured all cell structure. The rest of 

 the tumor was composed entirely of 

 laminated blood clot, fibrin and nucle- 

 ated red corpuscles with no evidence 

 of any structural tissue elements. The 

 red bUxxJ corpuscles had undergone 

 lysis. 



Origin of Luteal Cells 



The condition of the luteal cells is 

 of interest in view of Morgan's hy- 

 pothesis that it is this element of the 

 ovary which is responsible for the 

 henny feathering in birds. The his- 

 tology of the luteal tissue has been 



studied by Pearl and Boring, and ac- 

 cording to these authors it is first seen 

 as islets of clear cells situated in the 

 walls of the follicles and in the general 

 stroma. In atretic and discharged 

 follicles these multiply and the cells 

 migrate into the cavity where they 

 develop granules of lutear pigment in 

 the cyptoplasm. This account of the 

 transition of the islets of clear cells 

 into luteal tissue is not wholly convinc- 

 ing and on theoretical grounds would 

 appear unlikely. The histogenisis of 

 these islets of cells is being studied 

 l)v ^liss H. B. Fell, in this Department, 

 and she finds that they arise in the dis- 

 tal portion of the sex cords, con- 

 firming the conclusions of Fikert and 

 Nonicles. (J wing to the enlarge- 

 ment of the oocytes and relatively 

 slight increase in the stroma they 

 finally come to lie among the former 

 and are mostly incorporated in the 

 follicles. It would seem more prob- 



